Revised temperatures for two benchmark M-dwarfs – outliers no more

Abstract Well-characterised M-dwarfs are rare, particularly with respect to effective temperature. In this letter we re-analyse two benchmark M-dwarfs in eclipsing binaries from Kepler/K2: KIC 1571511AB and HD 24465AB. Both have temperatures reported to be hotter or colder by ≈1000 K in comparison w...

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Published inMonthly notices of the Royal Astronomical Society
Main Authors Martin, David V, Armitage, Tayt, Duck, Alison, Swayne, Matthew I, Martínez, Romy Rodríguez, Sethi, Ritika, Stassun, Keivan G, Gaudi, B Scott, Gill, Sam, Sebastian, Daniel, Maxted, Pierre F L
Format Journal Article
LanguageEnglish
Published 21.10.2024
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Summary:Abstract Well-characterised M-dwarfs are rare, particularly with respect to effective temperature. In this letter we re-analyse two benchmark M-dwarfs in eclipsing binaries from Kepler/K2: KIC 1571511AB and HD 24465AB. Both have temperatures reported to be hotter or colder by ≈1000 K in comparison with both models and the majority of other M-dwarfs in the literature. By modelling the secondary eclipses with both the original data and new data from TESS we derive significantly different temperatures: 2865 ± 27 for KIC 1571511B and 3081 ± 32 for HD 24465B from TESS and 3114 ± 32 K for HD 24465B from K2. These new temperatures are not outliers. Removing this discrepancy allows these M-dwarfs to be truly benchmarks. Our work also provides relief to stellar modellers. We encourage more measurements of M-dwarf effective temperatures with robust methods.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stae2266